Double stem core chill



March 1959 H. F. HOHLFELDER ETAL 2,879,565

DOUBLE STEM CORE CHILL 2 Sheets-Sheet 1 Filed May 14, 1957 Fig.7

Fig.6

INVENTORS. Harvey E Hoh/fe/der BY Thomas M. Reed THE/R ATTORNE rs March31, 1 959 H. F. HOHLFELDER ET AL DOUBLE STEM com; CHILL Filed May 14,1957 2 Sheets-Sheet v INVENTORS. Harvey Hah/fe/der Y Thomas W. ReedTHE/l? A TTORNE Y5 with have also been proposed United States PatentDOUBLE STEM CORE CHILL Harvey F. Hohlfelder, Perry, and Thomas W. Reed,

Cleveland, Ohio, assignors to The F. Hohlfelder Company, Cleveland,Ohio, a corporation of Ohio Application May 14, 1957, Serial No. 658,9812 Claims. (Cl. 22-174) forms a flush chill surface in the sand face ofthe core, the double stems thereof being firmly imbedded in thecoresand. After the core is positioned in the usual way in the metalreceiving cavity of a mold, and as molten metal is being cast, the onthe core cools at a different rate from the metal contacting the sand soas to produce the desired surface hardening or other directional heatflow required as the casting sets up.

Chill plates hitherto used in foundry practice are sometimes perforatedwith one or more holes for securing them to the mold core and in thatmanner they are nailed or otherwise secured in place by drivingfasteners through those holes and into the core. Wire attachment hookscarried by the chills and like type fasteners rigid therebut the priorchills generally have been awkward to install and even then the resultshave not proved too satisfactory because of failure of the chill to holdin place or its failure to chill with a uniform action because ofunoccupied fastener openings or other interruptions formed in thesurface thereof which plug or become filled with sand.

This invention largely eliminates the foregoing difiiculties, beingprovided, as indicated, with double stems for solidly anchoring theopposite ends of the plate section of the chill. Further, the chillpresents a full surface of chill by providing an uninterrupted orunitary plate section.

As above indicated the formed chill plate of our invention is primarilyadapted to be located flush with the surface of themold core sand withinthemetal receiving cavity of the mold. It is apparent that the plate canbe otherwise shaped and made to precisely conform with the flat-orconvex or concave surfaces of other parts of the mold cavity and ingenerally the same manner form a highly conductive metal surface portionsurrounded by the adjacent sand surface.

Further features, objects, and advantages of our invention will beapparent from the ensuing description metal that strikes the chill plate2,879,565 Patented Mar. 31, 1959 Figures 8, 9, and 10 are similar viewsshowing a further modification; and

Figures 11, 12, and 13 represent a steel strip in side elevation, topplan, and end elevation, respectively, illustrating various steps offabricating the chill.

Figure 1 illustrates the application of the plate chills during a coremolding operation. The mold includes a core box 10, a core pattern 12fitting within the side walls of the core box and resting on the bottomthereof (not shown), and a sand core 14 being rammed down the slightlytapered, but. generally cylindrical bore 16 through the core pattern 12.The sand 18 of the core 14 is rammed to a certain point in the bore andan external plate chill 20 is so placed as to face outwardly against thesurface of the bore and thereafter further sand is packed so as to holdthe plate chill 20 captive against the sand. When the ramming iscompleted the tween its opposite ends so as to tions at its free ends28,

core pattern 12 and core box 10 are inverted and then lifted away toleave the core 14 exposed, this core then being vented, sprayed, andbaked hard in the usual way.

In Figures 2, 3, and 4 the plate chill 20a comprises a metal shapeformed in one-piece from sheet metal and includes an elongated platesection 22 curved on the arc of a circle between its longitudinal sideedges and having down-turned tabs forming stems 24 at each of theopposite ends. Each stem 24 has a bend 26 beprovide inturnedporwithdrawal from the sand of the core 14. Slits 30,

coextensive with the bend radius at the base of the. stems 24 preventthe stems from interfering with the normal semi-cylindrical profile bentinto the plate section 22 enabling it to have cylindrical conformityabout an offset longitudinal axis of generation. This profile lies flushin each direction with the normal sand surface of the core 14 as notedin Figures 2 and 4.

In use, the plate section 22 confronts the surface 32 of the mold thatthe core 14 occupies and is directly exposed to the cast metal thatultimatelyoccupies the metal receiving cavity indicated at 34. In viewof the fact that the diagonally bent free terminals 28 do not occupy theparallelplanes that transversely intersect the surface of the platesection 22 at its opposite ends, the chill 20a has a locked self-holdingaction in the core sand that resists dislodgment.

In Figures 5, 6 and 7, a modified form of plate chill 20b is shownhaving double stems 36 which are straight between their ends and whichoccupy a common plane perpendicular to the end planes at the oppositeend of the surface of the plate section 20b. With respect to theselatter planes which are parallel to one another, the double stems 36have a selected angularity inwardly thereof, thus being diagonallyrelated to one another.

and fromthe drawings forming a part of this specification and whichillustrate certain preferred embodiments of our invention.

In the drawings:

Figure l is a longitudinal sectional view of our plate chill attached tothe sand core in a core box;

Figures 2, 3, and 4 are views of a preferred embodiment of our inventionshown in side elevation, end elevation and in perspective, respectively;

Figures 5, 6, and 7 are a similar arrangement of views but showing amodification thereof;

They are thus effective to provide a cross grip in the core sand therebypreventing dislodgment from the common mass of mold sand.

In Figures 8, 9 and 10, a modified form of chill 200 is shown havingdouble stems 38 which occupy the parallel end planes through the surfaceof the plate section at its opposite ends. The stems 38 are straightbetween their opposite ends, but are struck from diagonally oppositeends or, the

producing a cross grip resisting v v surface of the plate sec- 11011anda're of sufiicient length that in being turned As indicated inFigures 11, 12, and 13, a metal strip 42 is subjected to distinctoperations, in the notching, slitting, forming, and blanking of, a,slightly modified form of plate chill 20d, the blank being bent orrolled to complete the article. Figure 11 shows a progressive. die typepress in which the forming; tools are arranged, in tandem for concurrentoperation, although other known types of machine may be employed inwhich turrets with a rotatable die portion below and a tool carryingturret above are used for independent successive operations as the stripis advanced. As shown, a press 44 has a fixed press bed 46 and a head 48moving in the direction of the arrow 50 relative thereto as the strip 42is fed through the progressive dies (not shown).

Each fresh portion of the strip 42 is first subjected to a notchingoperation whereby metal indicated in the dotted, hatched area 54 isrelieved from the opposite edges of the strip. The notches are spacedapart providing tabs 56a captured from the. waste metal of the relievededges.

In the first forming operation the tabs are bent at 58 between theirends and in the second forming, opera! tion, the tabs are slit at 60 andpartially turned under to take the formation indicated at 56b givingsuificient clearance for a press bed die to, move against the undersideof the strip. In this case, the tabs are exactly transversely aligned atall times by pairs, the axis of one such pair being indicated at 62. Ina cut-off and finish form operation resulting in the final plate chill20d, the cut-off occurs along the edge 64 of the strip 42 and theopposite longitudinal edges of the short resulting strip. to form theplate section are turned downwardly to conform to the arc of a cylinder.The outside radius of bend is indicated at R in Figure 11. It is, notedthat the resulting stems 56c have parallel portions between the bend 58and the chill plate proper 20d and nonparallel free end portions whichare diagonally related to the parallel portions and thus extenddiagonally toward one another.

It is apparent that in the embodiment of Figure 10, the stems 38 areformed from tabs which are staggered with respect to one another on theopposite edges of the strip and that thus they do not align with oneanother along a common axis indicated at 62 in the embodiment of Figure12. It is noted that the stems 38 are generally congruent to therespective parallel end planes which transversely intersect the chillsurfaces at the opposite ends of the chill 20c, but that they difier intheir respective angularity of intersection with planes. mutuallyperpendicular to said parallel planes, for instance, the vertical plane41 in Figure 9 with which the stems 38 have angles of intersection thatare exactly opposite to one another.

Following is an example of the dimensions of a plate chill made oftwelve gauge metal in conformity with the foregoing embodiment of Figure4:

Inches Outside bend radius R 9% The plate chill described in the abovespecific ex,- ample was formed as noted from a'shape of 12 gauge,

light metal plate for use in a particular application. It is evidentthat chills are made in various lengths, widths, gauges, and radii tosuit the particular application desired.

The preceding embodiments of our improved chill will be noted to havedouble stems in all cases, these stems being diagonally related to oneanother in at least one sense so as to firmly cross-grip the common massof material in which they are embedded and thus hold the chill firmly inplace. The one-piece construction so as to form the complete chill froma unitary shape of sheet metal, is very attractive from a manufacturingand fabricating standpoint and the full chill surface is mostadvantageous in operation so as to provide uniform action.

While we have described certain presently preferred embodiments of ourinvention, it is to be understood that the invention may be otherwiseembodied within the spirit and scope thereof.

We, claim:

1. For use in a sand mold, a generally cylindrical core of compactedsand, a one-piece two-stem chill presenting a sheet metal external chillface flush with the surface of said core at a location thereon andcylindrically bent about an inwardly offset main axis so as to preciselyconform to the radius of curvature of said core at that location, andtwo integrally bent stems disposed one at each end of said sheet metalexternal face and each extending in a direction generally perpendicularthereto so asv to embed itself in the core, at least a portion of eachstem extending generally diagonally with respect to a correspondingportion of the other stem to mutually provide therewith an embeddedcross grip across the main dimension of the chill.

2. A method of manufacturing procedure for atlixing a double stem chillmeans and a packed sand core together, so as to produce cross grippingaction of the stems of the former in its union with the sand beingrammed in a sand core bore, said method comprising the improved steps ofproviding integral stems on the chill means disposed one at each end ofthe active chill base surface presented, and bent in the oppositegeneral direction inwardly from said base surface in a manner whereby atleast a portion of each stem extends generally References Cited in thefile of this patent UNITED STATES PATENTS 2,463,147 Bumbaugh Mar. 1,1949 2,532,302 Hayward Dec. 5, 1950 2,656,808 Plumeri et al. Oct. 27,1953 2,731,688 Jenkins et al. Jan. 24, 1956 OTHER REFERENCES The FannerManufacturing Company, Cleveland, 0hio, Catalog No. 1153, 1953, pages 20and 23 of interest.

